my attempt failed, but the String returned by my solution is the same as what was requested...don't understand

i can't understand question at all.
with my poor english...

so.. code master!
what do i do? capital all first letter in word? or un-capital all first letter in word?

Getting this error multiple times

Server Execution Error:
The server timed out waiting for the request to be processed. This may be due to high server load. Please try your request again.

=/

Maybe you forgot to do a null-check before?

It works without any problems.

What is the concrete problem?
Maybe you forgot to do a null-check before?

Array.prototype.sort() not working (Javascript)

I am getting
TypeError: Cannot read property 'sort' of null
at sumArray
at Object.handleError
The code is running smoothly, but i keep getting this error upon submitting. Please let me know if I am doing something wrong. Thank you